Brake and dampener for rocking bobbin magazines



BIN MAGAZINES March 9, 1948- R. s. TURNER BRAKE AND DAMPENER FOR ROCKING BOB Filed April 2, 1947 'INVENTOR RIGHARD G. TURNER ATTORNEY Patented Mar. 9, 1948 BRAKE AND DAMPENER FOR ROCKING BOBBIN MAGAZINES Richard G. Turner, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application April 2, 1947, Serial No. 138,883

This invention relates to improvements in weft replenishing looms of the type employing rocking magazines and it is the general object of the invention ,to provide means serving as a brake for the magazine when the latter rocks and also as a dampener to arrest vibration thereof during loom operation.

,A type of weft replenishing loom using two shuttles which has gone into extensive use utilizes a rocking magazine having two stacks of reserve bobbins. The magazine is mounted on a horizontal pivot and is ordinarily at rest during loom operation to permit transfer of the lowest bobbin in one of the stacks into one of the shuttles. When the other shuttle is to be replenished the magazine rocks from its normal position to place the lowest bobbin in the other stack in transferring position. Subsequent to transfer of a bobbin from the other stack the magazine returns to its normal position. It is found in the operation of such looms that'the return motion of the magazine against a stop is likely to cause undesired vibration resulting in disturbance of bobbins in the magazine. It is also found during loom operation when the magazine is at rest that the magazine vibrates with attendant roll- ;ng of the bobbins. This latter vibration is increased to some extent by the fact that the magazine is on a pivot and is ordinarily not held positively in fixed position with respect to the loom.

It is an important object of my present invention to provide a combined brake and damp-- ener which will serve as a shock absorber when the magazine returns to its normal position and also prevent vibration of the magazine when the latter is in its normal position.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of my invention is set forth.

Fig. 1 is a side elevation of a loom having my invention applied thereto and showing the magazine in full lines in its normal position and in dotted lines in one of its transferring positons.

Fig. 2 is an enlarged side elevation of the combined brake and dampener and adjacent parts showing the magazine in normal position,

Fig. 3 is a plan view looking in the direction of arrow 3, Fig. 2, parts being in section, and

Fig. 4 is a front elevation looking in the direction of arrow 4, Fig. 2, parts being in section.

2 Claims. (Cl. 139-232) Referring more particularly to Fig. 1, the'loom frame I0 is provided with a magazine support ll carrying a horizontal stud l2 on which is pivotaliy mounted a rocking magazine M. A stationary stop l3 on support ll limits movement of the magazine in a clockwise direction as viewed in Fig. 1 and-cooperates with spring it to hold the magazine in normal position. A rod it connected to the magazine has its rear end connected to a bell crank lever IB pivoted on the loom frame; A

rod l1 depending from the lever is provided with a hook l8 for engagement with a stud is carried,

by the rear end of an operating lever 20 pivoted on a stationary stud 2! carried by the loom frame.;

The rod i1 is controlled as to its horizontalposition by-a positioner 22 which moves in timed relation with the shuttle boxes not shown at that end of the loom opposite the magazine. When one of the shuttle boxes is active positioner 22 will locate hook is to the rear of stud ill, but when the other shuttle box is active positioner 22 moves forwardly to locate the hook l8 in the path of stud 19. When a replenishing operation is called lever 20 will rock in a clockwise direction and stud l9 will have an idle motion if hook I8 is behind the stud, thereby permitting the magazine to remain against stop l3. I

If, on the other hand, replenishment is called when hook is has been moved forwardly stud is will depress rod l1 to rock the magazine in a counter-clockwise direction, see dotted lines Fig. 1, away from stop l3 to locate the lowest bobbin in the other stack of bobbins in transfer position. As stud l9 rises under these latter conditions the magazine will be rocked back to its normal position by spring Hi. It is ordinarily necessary to move stud is to a sufliciently high position to permit hook l8 to move rearwardly therefrom. and the result of this condition is that the magazine engages stop is before stud l9 has completed its up motion. There is therefore an attendant shock or abrupt stoppage of the'magazine when it engages the stop l3. The effect of this sudden stoppage is to disturb the bobbins in the magazine and also tend to change the setting of the stop.

When the magazine is in its normal position it is subject to vibration due to loom operation. and this vibration causes the bobbins to roll on their axes with consequent undue tightening or slacking of their weft ends. The likelihood of vibration of the magazine is increased by the fact that it is supported on a pivotal mounting and is therefore subject to slight movements away from the stop It.

The foregoing is of usual construction and operation and is set forth more fully in my prior Patent No. 2,128,974. I

present invention into efl'ect I. vibration damp-,

34 on which is pivoted a brake arm 86. The rear end of the latter is provided with an adjustable stop screw 36 for engagement with a boss 31 on the carrier 80. The front end of arm 32.15 provided with a barrel 40 in which is located compression spring 4| the outer or free end of which engages the forward end of the brake arm 35. The latter may be provided with a material 42 such as leather for engagement with the inner vertical bobbin guide plate 43 of the magazine.

In normal operation the stop screw 36 is spaced slightly away from stop boss 31 so that the spring I can urge the friction pad 42 of the brake arm 36 against the magazine plate 43, thereby dampening vibration of the magazine. When a replenishing operation of the loom requires rocking of the magazine. plate 43 will move forwardly, or to the left as viewed in Fig. 3, out of engagement with the brake lever 35 and spring 4! will move the latter into the path of the plate 43 until such movement is stopped by screw 38.

When the magazine rocks back to its normalposition the rear part of plate 43 will engage the brake shoe the eifect of which is to retard return movement of the magazine so that the latter will approach its stop l3 gradually and without undue shock.

The brake arm 35 is preferably so located as to engage the upper part of the magazine plate 43 at a considerable distance above the pivot stud l2. The brake is sufficiently strong to arrest any tendency which the rocking magazine may have due to loom vibration to move around its support stud i2 away from the stop i3. There may be some vibration of the magazine during loom operation, but this vibration is reduced to a minimum due to thebrake arm 35.

From the foregoing it will be seen that I have provided a simple form of brake and vibration dampener having a yieldingly mounted brake arm 35 which engages a part of the magazine, such as plate 43, to prevent vibration of the magazine away from its stop It. Arm 35 also pad of friction retards return movement of the magazine to its normal position and therefore eliminates shock 'lilcldigt to engagement of the magazine with its s op Having thus described seen that changes and modifications may be made therein by those skilled "in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a weft replenishing loom having a frame. a reserve bobbin magazine having an end plate. a pivotal support for the magazine on the frame.

- a stop on the frame, a spring holding the magsaid spring thereafter 4 to normal position, and a. brake and vibration the stand, and resilient azine in normal position against the stop, means rocking the magazine about said pivotal support from said normal position to a transfer position, returning the magazine dampener member pivotally and resiliently mounted with respect to the loom frame and positioned to engage said end plate when the magazine returns to normal position to retard movement thereof and remain in engagement with said end plate when the magazine is in normal position to prevent vibration thereof around said pivotal mounting.

2. In a weft replenishing loom having a frame, a reserve bobbin magazine having an end plate, a pivotal support on the frame for the magazine, a stop on the frame, a spring holding the magazine in normal position against the stop, means rocking the magazine about said pivotal support from said normal position to a transfer position, said spring thereafter returning the magazine to normal position, a stand secured to the frame, a brake and vibration dampener arm pivoted on means on the stand holding the arm against said end plate to arrest vibration of the magazine around said pivotal support when the magazine is in normal position and engage said end plate to retard angular movement of the magazine about said pivotal support when the magazine returns to said normal posimy invention it will be 

